CN115019992A

CN115019992A - Target piece and target piece assembly for isotope production

Info

Publication number: CN115019992A
Application number: CN202210640871.4A
Authority: CN
Inventors: 杨磊; 张建荣; 张学智; 张雅玲; 杨阳阳; 张衡; 唐庆峰; 高笑菲; 詹文龙
Original assignee: Guangdong Provincial Laboratory Of Advanced Energy Science And Technology; Institute of Modern Physics of CAS
Current assignee: Guangdong Provincial Laboratory Of Advanced Energy Science And Technology; Institute of Modern Physics of CAS
Priority date: 2022-06-08
Filing date: 2022-06-08
Publication date: 2022-09-06

Abstract

The invention relates to a target for isotope production, comprising: the device comprises a graphite containing shell, a first cavity body and a second cavity body, wherein the upper surface of the graphite containing shell is provided with an inwards concave first cavity body, the bottom of the first cavity body is provided with an inwards concave second cavity body, and the bottom of the second cavity body is used for placing a target material; the graphite film is placed at the bottom of the first cavity and used for covering the second cavity and forming a closed cavity with the second cavity for containing the target, and the first cavity and the graphite film form a beam area. The target piece for isotope production can realize mass production of various isotopes, increase the types of products and has good heat dissipation performance.

Description

Target piece and target piece assembly for isotope production

Technical Field

The invention relates to the field of isotope production, in particular to a target and an assembly for isotope production.

Background

Radioactive isotopes have been widely used in various fields such as industry, agriculture, medicine, and the like, and have obtained significant economic, social, and environmental benefits. Especially in the medical field, has irreplaceable effects in the aspects of disease diagnosis and treatment.

Based on devices such as an accelerator, an isotope production target and the like, a series of nuclear reaction processes occur in the target by acting beam current on target materials of different elements or isotopes, and various isotope products can be obtained and utilized.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide a target and an assembly for isotope production, which can simultaneously achieve mass production of multiple isotopes and increase the types of products during irradiation of high-power beams, and have good heat dissipation performance.

In order to achieve the purpose, the invention adopts the following technical scheme:

in one aspect, the present invention provides a target for isotope production, comprising:

the device comprises a graphite containing shell, a first cavity body and a second cavity body, wherein the upper surface of the graphite containing shell is provided with an inwards concave first cavity body, the bottom of the first cavity body is provided with an inwards concave second cavity body, and the bottom of the second cavity body is used for placing a target material;

the graphite film is placed at the bottom of the first cavity and used for covering the second cavity and forming a closed cavity with the second cavity for containing the target, and the first cavity and the graphite film form a beam area.

Further, the first cavity and the second cavity are both cylindrical cavities.

Further, the graphite containing shell comprises a flange and a cylinder connected to the bottom of the flange, and the first cavity is arranged on the upper surface of the flange.

According to another aspect of the technical scheme, the target assembly for isotope production comprises a graphite tray and the target for isotope production, wherein a plurality of mounting grooves are formed in the graphite tray, and the target is mounted in the mounting grooves.

Furthermore, a plurality of mounting grooves are formed on the graphite tray, a plurality of target pieces are mounted in the mounting grooves, and each mounting groove corresponds to one target piece.

Further, a plurality of the mounting grooves are arranged in an array along horizontal and vertical directions.

Further, different target materials within the target piece are used to produce different isotopes.

Further, still include the cooler, the graphite tray places on the cooler, the cooler is used for cooling and support graphite tray.

Further, the cooling working medium of the cooler is water or liquid metal.

Due to the adoption of the technical scheme, the invention has the following advantages:

the target piece for isotope production provided by the invention utilizes the good heat-conducting property of graphite to improve the heat-radiating performance in the isotope production process by the arrangement of the graphite containing shell and the graphite film.

As the target material can generate radioactive particle beams when acting with the beam, the graphite can only generate isotopes containing No. 8 elements and less than No. 8 elements in the process of irradiating the particle beams, and most of the graphite is short half-life products, compared with a target material of a heavier element, the generated radioactivity and toxicity are lower, and the treatment difficulty of radioactive waste is effectively reduced, the invention reduces the generation of radioactive products through the arrangement of the graphite film and the graphite containing shell.

The target assembly provided by the invention can realize mass production of various isotopes by the arrangement of the graphite tray and the plurality of mounting grooves on the graphite tray, and the types of products are increased.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Like parts are designated with like reference numerals throughout the drawings. In the drawings:

FIG. 1 is a schematic structural view of one embodiment of a target for isotope production;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is a schematic diagram of an embodiment of a target assembly for isotope production

In the drawings, the reference numerals denote the following:

1-graphite containing shell, 2-graphite film, 3-target material, 4-mounting groove, 5-graphite tray, 11-flange and 12-cylinder.

Detailed Description

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

The embodiment of the invention provides a target piece and a target piece assembly for isotope production, wherein the target piece comprises a graphite containing shell, a graphite film and a target material, an inwards-concave first cavity is formed on the upper surface of the graphite containing shell, an inwards-concave second cavity is formed at the bottom of the first cavity, and the bottom of the second cavity is used for placing the target material. The graphite film is arranged at the bottom of the first cavity and used for covering the second cavity and forming a closed cavity with the second cavity for containing the target, and the first cavity and the graphite film form a beam area. And the beam current penetrates through the graphite film from the beam current area and then interacts with the target material to generate the target medical isotope. The high-power beam irradiation device can realize mass production of various isotopes at the same time, increase the types of products and simultaneously has good heat dissipation performance.

Example 1

As shown in fig. 1 and 2, the target includes a graphite-containing shell 1 and a graphite film 2, and the graphite-containing shell 1 includes a flange 11 and a cylindrical body 12 connected to the bottom of the flange 11. An inwards-recessed first cavity is formed on the upper surface of the flange 11, an inwards-recessed second cavity is formed at the bottom of the first cavity, a target 3 is placed at the bottom of the second cavity, and the target 3 is an element or isotope used for producing a medical isotope by an accelerator.

The graphite film 2 is placed at the bottom of the first cavity, is used for covering the second cavity and forms a closed cavity with the second cavity for containing the target 3. The first cavity and the graphite film 2 form a beam current area. After passing through the graphite film 2 from the beam area, the beam interacts with the target 3 to generate the target medical isotope. The beam current used may be protons, electrons, alpha particles or other charged particles. The beam interface side comprises a graphite film 2, and the beam penetrates through the graphite film 2 from the area and interacts with a target 3 to generate a target medical isotope.

The graphite has a large heat conductivity coefficient, the beam loses energy in the target 3 and has high power density distribution, and the graphite is used as an excellent heat conductor, so that the target can be well radiated. Because the target 3 can generate radioactive particle beams when acting with the beams, the graphite can only generate isotopes containing No. 8 elements and the following elements in the process of irradiating the particle beams, and most of the isotopes are short half-life products, compared with a target material with heavier elements, the generated radioactivity and toxicity are lower, and the difficulty in disposing the radioactive waste is effectively reduced. Therefore, the graphite film 2 is laid in the invention, so that the generation of radioactive substances in the isotope production process can be reduced. Meanwhile, graphite can realize good heat dissipation due to large heat conductivity coefficient. In addition, the graphite film 2 has a small atomic number, low density and small loss to beam current. Meanwhile, the graphite film 2 and the graphite containing shell 1 form a coating shell together, and the release of radioactive gas generated in the irradiation process of the target piece is effectively prevented.

Example 2

As shown in fig. 3, example 2 of the present invention provides a target assembly for isotope production, including a plurality of targets and graphite trays 5 provided in example 1. The graphite tray 5 is provided with a plurality of mounting grooves 4, a plurality of target pieces are mounted in the mounting grooves 4, and each mounting groove 4 corresponds to one target piece. The mounting grooves 4 are arranged on the graphite tray 5 in an array along the horizontal direction and the vertical direction, and specifically may be arranged in an array manner of 1 × 4, 2 × 2, 4 × 5, and the like. The target materials 3 in different target members may be the same or different.

A plurality of target pieces can be mounted on the graphite tray 5, and the disc-shaped target material inside the target pieces can also be different elements and is used for producing different isotopes at the same time. Isotope production target spare of installation on the graphite tray 5 can be comparatively taken out and transport from the hot chamber environment fast, greatly improves transport efficiency. A plurality of independent isotope production target pieces are arranged on the graphite tray 5, and after beam irradiation is finished and transfer is finished, the graphite tray 5 can be reused, so that less radioactive waste can be effectively generated.

During the action of the beam on the target material, the energy of the beam is deposited in the target and converted into heat energy, resulting in a continuous increase in the temperature of the target while the heat is transferred to the graphite tray 5. It is therefore necessary to place the target together with the graphite tray 5 on a cooler (not shown) having good cooling performance to form a practical device. At present, the on-line cooling mode mainly comprises water cooling or liquid metal cooling.

The beam current passes through the graphite film 2 and then directly or indirectly reacts with the target 3. The energy deposition power density of the beam in the target 3 is gradually attenuated along with the increase of the penetration depth of the beam, and the beam power is almost completely deposited on the target. After the target 3 transfers part of heat to the graphite tray 5, the graphite tray 5 continues to transfer the heat to the cooler; the position of the target far away from the beam interface is directly contacted with the cooler, and part of heat is directly transferred to the cooler through the position far away from the beam interface of the target 3. The heat transfer quantity transfer is improved by increasing the contact heat transfer area, and the target material cooling device has a good cooling effect.

Through the structure, the device can realize mass production of various isotopes when high-power beam irradiation, increase the types of products and simultaneously have good heat dissipation performance.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A target for isotope production, comprising:

2. The target for isotope production of claim 1, wherein the first and second cavities are both cylindrical cavities.

3. The target for isotope production of claim 2, wherein the graphite containment housing comprises a flange and a cylinder connected to a bottom of the flange, the first cavity being disposed on an upper surface of the flange.

4. A target assembly for isotope production, comprising a graphite pallet and a plurality of target members for isotope production according to any of claims 1 to 3, wherein a plurality of mounting grooves are formed on the graphite pallet, and the target members are mounted in the mounting grooves.

5. The target assembly for isotope production of claim 4, wherein a plurality of mounting slots are formed on the graphite tray, a plurality of the target pieces being mounted in the mounting slots, one for each of the target pieces.

6. The target assembly for isotope production according to claim 5, wherein a plurality of the mounting slots are arranged in an array along horizontal and vertical directions.

7. The target assembly of claim 5, wherein different targets in the target are used to produce different isotopes.

8. The target assembly for isotope production of claim 7, further comprising a cooler upon which the graphite tray is placed, the cooler for cooling and supporting the graphite tray.

9. The target assembly for isotope production of claim 8, wherein the cooler cooling medium is water or a liquid metal.